CN102306982B - Universal slot punching mold base for round stator and rotor laminations - Google Patents
Universal slot punching mold base for round stator and rotor laminations Download PDFInfo
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- CN102306982B CN102306982B CN 201110252783 CN201110252783A CN102306982B CN 102306982 B CN102306982 B CN 102306982B CN 201110252783 CN201110252783 CN 201110252783 CN 201110252783 A CN201110252783 A CN 201110252783A CN 102306982 B CN102306982 B CN 102306982B
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Abstract
The invention provides a universal slot punching mold base for round stator and rotor laminations. The cutting edge part of a mold can be accurately reset to ensure that the position of a punched slot is accurate and invariable when a cutting edge is sharpened. The universal slot punching mold base comprises an upper template and a female mold holder which are vertically opposite to each other. The upper part of the female mold holder is provided with a female mold cavity for arranging a female mold. The lower part of the upper template is provided with a conductor plate capable of sliding up and down relative to the upper template. Rubber is arranged between the upper part of the conductor plate and the lower part of the upper template. The lower part of the upper template is provided with a connecting part for connecting a male mold fixing part. A male mold hole for passing through a male mold connected to the male mold fixing plate is formed on the conductor plate. The upper part of the upper template is connected with a wedge for fit between the outer bottom circle of a cylindrical guide handle connected with a sliding block of a slot puncher and an inner hole on the wedge. A directional key is fixed on the upper part of the inner hole of the wedge, fitted with a directional slot on the bottom surface of the guide handle and extended along the radial direction of the cylindrical guide handle. A connecting structure for connecting the slot puncher is arranged on the wedge.
Description
Technical field
The present invention relates to the jet-bedding universal die set of a kind of full circle type rotor punching, specifically, a kind of high accuracy Restoring and guiding full circle type rotor punched sheet notching universal die set.
Background technology
The stator and rotor iron core of wind-driven generator, asynchronous motor is its vitals.The workmanship of iron core always is one of important symbol of weighing the motor manufacturing technology level.One of key factor that affects the iron core workmanship is exactly the jet-bedding quality.The notching process overwhelming majority of middle size motor full circle type stator and rotor punching all adopts at the Special punching scouring machine and carries out the single entry jet-bedding, the single entry jet-bedding then is easy to produce the trough position degree error, thereby the flute profile and the inside and outside circle that cause laminating back core are neat not, and quality is unstable.In order to solve this difficult problem, the domestic electrician's special equipment of one side producer is devoted to develop the Special punching scouring machine of high-precision calibration; Tool structure, the optimization notching process of notching die then set about improving by motor manufacturing firm on the other hand.
For a long time, the employed notching die tool structure of domestic electric machine factory is substantially just like a, the b shown in the figure one, three kinds of simple simple and easy die structure for the slot patterns of c.Structurally there are many disadvantages in these notching dies, can not guarantee the coherence request of punching flute profile.Its subject matter is as follows:
One, simple and easy notching die is not structurally considered orientation, the position fixing of trough position.Thereby behind reconditioning cutting edge repeatedly, will produce the offset deviation shown in b, c, d, e among Fig. 2 owing to adjusting position deviation, the trough position that cutting edge produces.These deviations all can have a strong impact on and laminate flute profile unshakable in one's determination and the regularity of inside and outside circle.Among Fig. 2, a is the normal schematic diagram of flute profile, and b is the right tiltedly schematic diagram of flute profile, and c is the left tiltedly schematic diagram of flute profile, and d moves the T schematic diagram on the flute profile, and e is that flute profile moves down the T schematic diagram.
Two, simple and easy die structure for the slot, punch and matrix is without sharpening resetting means accurately.Therefore, cutting edge of every mill, the operator just must carefully adjust the cutting edge gap, and this is difficult to grasp, and is also very inconvenient in the operation.When the gap adjustment not at that time, will make that to rush the monolateral burr of part excessive, even can gnaw the cutting blade mouth.Facts have proved, the gap is inhomogeneous, and it is one of key factor that reduces die life that cutting edge is in the heel and toe wear state.
Three, simple and easy die structure for the slot, without guider, and punch and matrix is not linked to be integral body, and cutting edge is difficult to accurately reset during stamping-out.When the notching press low precision, will obviously reduce die life.
Along with to the raising of full circle type motor stamping punch process required precision (particularly stator punching jet-bedding separation circuit and rotor punching jet-bedding cut cylindrical operation very high to flute profile and inside and outside round required precision), traditional simple die structure for the slot can not satisfy the requirement of actual production.
Summary of the invention
The purpose of this invention is to provide a kind ofly when the reconditioning cutting edge, die point part can parking position accuracy, to guarantee to go out the accurately jet-bedding universal die set of constant full circle type rotor punching of trough position.
The jet-bedding universal die set of full circle type rotor punching, it comprises relative up and down cope match-plate pattern, die socket, be provided for placing the matrix cavity of die on die socket top, be provided with the guide plate body that can slide up and down with respect to cope match-plate pattern in the cope match-plate pattern bottom, between guide plate body top and cope match-plate pattern bottom, be provided with rubber, have for the connecting portion that connects punch retainer in the bottom of cope match-plate pattern, be provided for passing the punch hole of the punch that is connected on the punch retainer at the guide plate body; Connect wedge on cope match-plate pattern top, be used for the bottom cylindrical of the cylindrical guiding handle that links to each other with the notching press slide block and cooperate with endoporus on the wedge; Be fixed with directional bond on wedge endoporus top, directional bond cooperates the guide slot on the bottom surface with guiding, and directional bond is along the radially extension of cylindrical guiding handle; Be provided with the syndeton that links to each other for notching press on the wedge.
Beneficial effect of the present invention: considered directed, position fixing on the structure of the present invention, the part of the upper die can parking position accuracy.Be described as follows.Cooperate to guarantee orientation, position fixing to 17 with directional bond 18, wedge 20 accurate by guiding.Wherein, guiding 17 bottom cylindricals and wedge 20 endoporus (circle) cooperate and cooperating of directional bond 18 and guide slot (leading the keyway on 17) all adopts the gap to locate cooperation H7/h6(according to actual operation requirements, can also adopt the precision positioning of higher level to cooperate, such as H7/k6, H7/m6 etc.), part can freely be installed and removed, and when work relative transfixion.Directional bond 18 is fixed on the wedge 20.During use, guiding after adjusting first flute profile aligning radiation, just is fastened on 17 positions on the notching press slide block, as the benchmark of centering, orientation, no longer tears open later on.When needing the reconditioning cutting edge, the syndeton (such as tommyhead bolt 14) that wedge links to each other with notching press is unclamped, send the sharpening mouth part of the upper die integral body of the compositions such as wedge, cope match-plate pattern, guide plate body, punch retainer, punch.When filling again, because being arranged, the guiding on the slide block of being fixed on does centering, orientation to 17, therefore the trough position after resetting is accurately constant.The trough position deviation shown in b, c, d, e among Fig. 2 that multiple dress deviation when effectively having eliminated owing to the sharpening mouth produces.
Above-mentioned jet-bedding universal die set, the cross section of matrix cavity meets at right angles trapezoidal.Preferably, have groove on the top of die socket, a side guide that removably connects is set in groove, have relative limiting plate and the fishplate bar that is connected on the die socket in the front and back end of groove; The opposite face of limiting plate and fishplate bar, the side of side guide, groove one side, groove floor have formed described matrix cavity; The side guide side of composition matrix cavity is bottom-up to tilt in matrix cavity.Preferably, be provided with for the screw that the die that is positioned at matrix cavity is pressed on the limiting plate at fishplate bar.
The side of die, one side is subjected to the compression of side guide and its another side (right angle face) tightly is attached on the right-angled side faces of matrix cavity; The front-back of die, one side is installed in the pressing of screw on the fishplate bar and another side tightly is attached on the limiting plate.
The die position can both high accuracy reset behind the sharpening like this, at every turn.The below specifies.Fig. 3 is the structure of traditional die, can find out, and the Die Design of the jet-bedding submodule after the improvement, obviously different from the die that improves front jet-bedding submodule.Its main difference part is, die two sides m before improving ", n " is die pressing plate angle a=10 ° inclined-plane (being fixed face), its shortcoming is, can be produced side-play amount (shift in position amount after the cutting edge reconditioning) (see figure 3) of A=tga * h1 behind the sharpening mouth by reconditioning quality h1, h0 is the die elemental height among Fig. 3; H is die height after the reconditioning.
After the assembling, the cutting edge position is to skew on one side.Must readjust the cutting edge of die gap behind the Gu Morenkou.After the improvement, in attached 7,8, the p face of die 1 be 10 ° of inclined-planes as seal face, in addition three m, n, q are vertical plane, take this m, n face as benchmark, with p face, q face for the face of exerting pressure.And in accompanying drawing 4, because the m ＇ face of die socket 2 and the accurate benchmark of n ＇ face conduct of limiting plate 35 are arranged, and because m ＇ face, n ＇ face are accurate vertical plane, therefore A=0 behind the sharpening, namely the sharpening mouth fills rear without the position offset deviation again.So after both assemblings, can reach high accuracy and reset.The operator need not estimate light is adjusted the cutting edge gap, just can guarantee evenly (annotating: must adjust evenly the gap first) of cutting edge gap; And can outside lathe, operate, simple and convenient.
Above-mentioned jet-bedding universal die set is provided with the adjusting backing plate on the groove floor, the upper surface of the opposite face of limiting plate and fishplate bar, the side of side guide, groove one side, adjusting backing plate has formed described matrix cavity.
Above-mentioned jet-bedding universal die set, cope match-plate pattern slide up and down with die socket by ball guide pillar guide pin bushing pair and link to each other, and the guide plate body also slides up and down with cope match-plate pattern by slip guide pillar guide pin bushing pair and links to each other.
Above-mentioned jet-bedding universal die set, it also comprises punch retainer, be connected to punch on the punch retainer, be positioned at the die of described matrix cavity; Punch retainer is bolted the bottom at cope match-plate pattern.
Above-mentioned jet-bedding universal die set, it also comprises punch retainer, be connected to punch on the punch retainer, be positioned at the die of described matrix cavity; Punch retainer is bolted the bottom at cope match-plate pattern; The cross section of die is and the corresponding right-angled trapezium of matrix cavity.Preferably, it also comprises the punch guide plate that is connected to guide plate body bottom, has the guide plate hole of passing for punch on the punch guide plate.Increased a backing plate between cope match-plate pattern and punch retainer, this backing plate is connected connection and is had the through hole of stepping down with punch retainer in order not affect cope match-plate pattern.
But the invention provides a kind of universal die set that can be widely used in the high accuracy Restoring and guiding of the moulds such as full circle type stator and rotor punched sheet notching, jet-bedding separate, jet-bedding is cut air gap.
Description of drawings
Fig. 1 is simple and easy die structure for the slot schematic diagram.
Fig. 2 is the schematic diagram that cutting edge fills the flute profile deviation that deviation causes again.
Fig. 3 is traditional die (compression) structural representation.
Fig. 4 universal die set installation diagram of the present invention
Fig. 5 is the vertical view of the parts such as the die socket, base among Fig. 4.
Fig. 6 is the A-A cutaway view Amplified image among Fig. 4.
Fig. 7 is jet-bedding submodule structure schematic diagram.
Fig. 8 is the die schematic diagram among Fig. 7.
Embodiment
Referring to Fig. 4-8, the jet-bedding universal die set of this full circle type rotor punching comprises relative up and down cope match-plate pattern 9, die socket 2, is provided for placing the matrix cavity 51 of die on die socket top.
The upper end of punch 48 and punch retainer 49 are fixing.Punch guide plate 47 is connected to guide plate body bottom by spring washer 38, screw 39.Has the punch hole on the lower end guide plate body of punch 48; Has the guide plate hole on the punch guide plate.When carrying out jet-bedding work, the lower end of punch 48 passes the punch hole and the guide plate hole is stretched in the die 46.
Wedge 20 is located by connecting on the top of cope match-plate pattern by screw 11, straight pin 14.Being used for the guiding link to each other with the notching press slide block cooperates 17 bottom cylindrical 52 with endoporus on the wedge.By screw 16, straight pin 19 directional bond 18 that has been located by connecting, directional bond 18 cooperates guide slot on the bottom surface with guiding on wedge top, and directional bond is along the radially extension of the handle that leads; Be provided with hex nut 13, packing ring 13, tommyhead bolt 14 etc. on the wedge for the syndeton that links to each other with notching press.
Die socket 2 is fixed on the base 1 by hex nut 32, packing ring 33, tommyhead bolt 34.Top at die socket 2 has groove, arranges on the groove floor to regulate backing plate 37.A side guide 42 is set in groove, and side guide 42 is connected on the die socket 2 by screw 40, spring washer 41, and screw 3 is against side guide 42 1 sides.Have relative limiting plate 35 and the fishplate bar 43 that is connected on the die socket in the front and back end of groove.The inclined side of the side of the side n' of limiting plate, the fishplate bar relative with side n', the side m ' of groove, the side guide relative with side m ', the upper surface of regulating backing plate have formed the described cross section trapezoidal matrix cavity that meets at right angles.The side guide side of composition matrix cavity is bottom-up to tilt in matrix cavity.
Advantage of the present invention:
1. considered directed, position fixing on the structure, the part of the upper die can parking position accuracy.
Cooperate to guarantee orientation, position fixing to 17 with directional bond 18, wedge 20 accurate by guiding.Wherein, guiding 17 bottom cylindricals and wedge 20 inner circles cooperate and directional bond 18 with lead all adopting the gap to locate cooperation H7/h6(according to actual operation requirements cooperating of 17 keyways, can also adopt the precision positioning of higher level to cooperate, such as H7/k6, H7/m6 etc.), part can freely be installed and removed, and when work relative transfixion.Directional bond 18 is fixed on the wedge 20 by straight pin and screw.During use, guiding after adjusting first flute profile aligning radiation, just is fastened on 17 positions on the notching press slide block, as the benchmark of centering, orientation, no longer tears open later on.When needing the reconditioning cutting edge, with tommyhead bolt 14 1 demolitions, screw 7 is unscrewed (but need not to pull down) and take down rubber 26, send the sharpening mouth whole mould bases.When filling again, because being arranged, the guiding on the slide block of being fixed on does centering, orientation to 17, therefore the trough position after resetting is accurately constant.Effectively eliminated the trough position deviation such as b, c, d, e among Fig. 2 that is produced by the sharpening mouth.
2. the die position can high accuracy reset.
Take jet-bedding submodule structure (seeing Fig. 7,8) as example, and see Fig. 4-6 after the assembling of this universal die set.Fig. 3 is the compressing structure of traditional die, can find out, and the jet-bedding submodule Die Design after the improvement, obviously different from the jet-bedding submodule die before improving.Its main difference part is, improves front die both sides and is 10 ° of inclined-planes (being fixed face), and its shortcoming is, can be produced the side-play amount (see figure 3) of A behind the sharpening mouth by reconditioning quality h1, and after the assembling, the cutting edge position is to skew on one side.Must readjust the cutting edge of die gap behind the Gu Morenkou.After the improvement, the p face of die 1 is 10 ° of inclined-planes, and as seal face, in addition three m, n, q are accurate vertical plane, take this m, n face as benchmark, with p face, q face for the face of exerting pressure.Among Fig. 5, because the m ＇ face of die socket 2 and the accurate benchmark of n ＇ face conduct of limiting plate 35 are arranged, and because m ＇ face, n ＇ face are accurate vertical plane, therefore A=0 behind the sharpening, namely the sharpening mouth fills rear without the position offset deviation again.So after both assemblings, can reach high accuracy and reset.The operator need not estimate light is adjusted the cutting edge gap, just can guarantee evenly (annotating: must adjust evenly the gap first) of cutting edge gap.And can outside lathe, operate, simple and convenient.
3. increase by one group and regulate backing plate, be convenient to finely tune the cutting edge height of die.
Consider cutting edge reconditioning quality 0～h1, the reduction of die height can make die plane and locating shaft pallet face height change, and punching and pallet, die face can not be contour, the stable meeting of sheet bottom land, the excircle dimension precision of liquidating exerts an influence, therefore the die bottom surface has increased by one group of adjusting backing plate 37 when designing.Certainly, according to the difference to the punching required precision, this group is regulated the further refinement of thickness series of pad, namely tells how different thickness series so that the cutting edge height of fine setting die.Behind the sharpening, can choose the adjusting backing plate of respective thickness according to the sharpening amount, see Fig. 4 to keep H() highly constant.Design also is conducive to carry out production strictly in line with rules and regulations simultaneously to guaranteeing that the stable of punching dimensional accuracy is very necessary like this.
4. accurate guiding and cutting edge protection mechanism are arranged.
Can find out in Fig. 4, the guiding of this mould bases is divided into two parts: (1) mould bases body is rear side guiding mould bases, adopts accurate ball guide pillar, make whole mould bases in high jig frequency running nimbly and freely, light played high-precision guide effect.(2) at guide plate body 31 four pairs little guide pillars 27, little guide pin bushing 24 are housed, as slide-and-guide.Its effect is to being contained in punch guide plate 47(on the guide plate body 31 stripper effect of holding concurrently, seeing Fig. 7,8) lead protection drift, and the side force can bear certain asymmetric jet-bedding the time.Owing to above-mentioned good guiding and protection being arranged, have greatly improved the useful life of die point, and can be used for middling speed even high speed blanking.
5. be conducive to save mold materials, reduce the mould manufacturing expense.
In the present industry, have by punch and matrix parking position accuracy after the die of submodule and punch retainer increase little slip guide pillar to guarantee sharpening, done like this two drawbacks, the one, make little slip guide pillar although used every pair of submodule of universal die set all also will join; The 2nd, the die of every pair of submodule all will additionally increase a lot to ensure the little slip guide pillar of enough space mounting.Like this, increased the submodule manufacturing cost on the one hand, submodule cutting edge material can not be utilized effectively on the other hand.Universal die set structure of the present invention, punch and matrix is not by being installed in the slip guide pillar direct reduction on the submodule, but the reference for installation by separately finds accurate location before the separately sharpening dismounting to come Indirect reduction, the punch and matrix design of every pair of submodule is all reached to be minimized, the needs of actual stamping-out are depended in the design that is punch and matrix in the submodule fully, and need not consider the restriction of other factors.So not only can save expensive submodule cutting edge material, improve the utilance of submodule cutting edge material, can also reduce the whole manufacturing expense of submodule.
6. good versatility is arranged.
On structure, this universal die set more complicated, the accuracy of manufacture is had relatively high expectations, and cost is also more expensive.Yet this mould bases has taken into full account the versatility of mould bases when design.This mould bases is full circle type stator and rotor punching universal die set, and notching die, jet-bedding splitting die, the jet-bedding that can be widely used in the punching of full circle type stator and rotor are cut air gap mould etc.When needs conversion product, only need design, make the submodule shown in Fig. 7,8, then support the use with this universal die set to get final product.As seen, the versatility of this universal die set is very strong, and Technical Economy is very reasonable.
7. high, the good stability of the reliability of long-time running.
It is high that this universal die set and each jet-bedding submodule are used in conjunction with reliability, good stability.(1) be used in conjunction with as example to cut the air gap submodule with the rotor jet-bedding, the cylindrical precision that jet-bedding is cut behind the air gap is very high, and rotor iron core laminated rear flute profile and cylindrical have accomplished that rotor core does not need the requirement of turning air gap all in good order.(2) submodule cutting edge high life, the punching burr is little and highly stable.Use Cr12 as example with mold materials, sharpening life-span of simple and easy notching die is about 5～60,000 times, and after using this universal die set a sharpening life-span reached more than 300,000 times the achievement highly significant.(3) the cutting edge resetting technique is reliable and stable.Harmonize first behind the cutting edge gap, during the repeated disassembled and assembled submodule, cutting edge still can keep the gap evenly constant.(4) realize sharpening fast assembling-disassembling function, under normal circumstances, can finish a dismounting within five minutes.Greatly shortened the sharpening disassembly and assembly time.
Claims (9)
1. the jet-bedding universal die set of full circle type rotor punching, it comprises relative up and down cope match-plate pattern, die socket, be provided for placing the matrix cavity of die on die socket top, be provided with the guide plate body that can slide up and down with respect to cope match-plate pattern in the cope match-plate pattern bottom, between guide plate body top and cope match-plate pattern bottom, be provided with rubber, have for the connecting portion that connects punch retainer in the bottom of cope match-plate pattern, be provided for passing the punch hole of the punch that is connected on the punch retainer at the guide plate body; It is characterized in that: connect wedge on cope match-plate pattern top, be used for the bottom cylindrical of the cylindrical guiding handle that links to each other with the notching press slide block and cooperate with endoporus on the wedge; Be fixed with directional bond on wedge endoporus top, directional bond cooperates the guide slot on the bottom surface with guiding, and directional bond is along the radially extension of cylindrical guiding handle; Be provided with the syndeton that links to each other for notching press on the wedge; Top at die socket has groove, and a side guide that removably connects is set in groove, has relative limiting plate and the fishplate bar that is connected on the die socket in the front and back end of groove; The opposite face of limiting plate and fishplate bar, the side of side guide, groove one side, groove floor have formed described matrix cavity; The side guide side of composition matrix cavity is bottom-up to tilt in matrix cavity.
2. jet-bedding universal die set as claimed in claim 1, it is characterized in that: the cross section of matrix cavity meets at right angles trapezoidal.
3. jet-bedding universal die set as claimed in claim 1 is characterized in that: be provided with the adjusting backing plate on the groove floor, the opposite face of limiting plate and fishplate bar, the side of side guide, groove one side, the upper surface of regulating backing plate have formed described matrix cavity.
4. jet-bedding universal die set as claimed in claim 1 is characterized in that: be provided with for the screw that the die that is positioned at matrix cavity is pressed on the limiting plate at fishplate bar.
5. jet-bedding universal die set as claimed in claim 1, it is characterized in that: cope match-plate pattern slides up and down with die socket by ball guide pillar guide pin bushing pair and links to each other, and the guide plate body slides up and down with cope match-plate pattern by slip guide pillar guide pin bushing pair and links to each other.
6. jet-bedding universal die set as claimed in claim 1 it is characterized in that: further comprising punch retainer, is connected to punch on the punch retainer, is positioned at the die of described matrix cavity; Punch retainer is bolted the bottom at cope match-plate pattern.
7. jet-bedding universal die set as claimed in claim 2 it is characterized in that: further comprising punch retainer, is connected to punch on the punch retainer, is positioned at the die of described matrix cavity; Punch retainer is bolted the bottom at cope match-plate pattern; The cross section of die is and the corresponding right-angled trapezium of matrix cavity.
8. jet-bedding universal die set as claimed in claim 7 it is characterized in that: further comprising the punch guide plate that is connected to guide plate body bottom, has the guide plate hole of passing for punch on the punch guide plate.
9. jet-bedding universal die set as claimed in claim 7, it is characterized in that: increased a backing plate between cope match-plate pattern and punch retainer, this backing plate is connected connection and is had the through hole of stepping down with punch retainer in order not affect cope match-plate pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110252783 CN102306982B (en) | 2011-08-30 | 2011-08-30 | Universal slot punching mold base for round stator and rotor laminations |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110252783 CN102306982B (en) | 2011-08-30 | 2011-08-30 | Universal slot punching mold base for round stator and rotor laminations |
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| CN102306982A CN102306982A (en) | 2012-01-04 |
| CN102306982B true CN102306982B (en) | 2013-04-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102688932A (en) * | 2012-06-07 | 2012-09-26 | 天津滨海通达动力科技有限公司 | Single-groove punching die with general die frame and matched die pins |
| CN103240338B (en) * | 2013-05-16 | 2016-11-02 | 张云亮 | Quasi-diel and manufacturing process thereof |
| CN106270124A (en) * | 2015-05-26 | 2017-01-04 | 苏州工业园区金鑫模具制造有限公司 | High-speed punching mesh mould |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201052536Y (en) * | 2007-04-30 | 2008-04-30 | 徐荣祖 | Motor stator and rotor necking mold |
| CN101700547B (en) * | 2009-04-20 | 2011-09-21 | 上海电气集团上海电机厂有限公司 | Slitting punching groove die of stator punching sheet |
| CN201644610U (en) * | 2010-03-29 | 2010-11-24 | 常州市耀华电机设备有限公司 | Tangential feeding device for numerical control notching machine |
| CN102142744B (en) * | 2011-01-07 | 2013-06-19 | 山东齐鲁电机制造有限公司 | Dividing die for punching slot for motor stator whole-circle punching sheet |
| CN202309402U (en) * | 2011-08-30 | 2012-07-04 | 南京汽轮电机长风新能源股份有限公司 | Universal notching die-set for fully-circular-type stator/rotor sheet |
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